A light spectrum is formed on a screen using a diffraction grating. The entire apparatus (source, grating and screen) is now immersed in a liquid of refractive index 1.33. As a result, the pattern on the screen: 

A. remains the same 

B. spreads out 

C. crowds together 

D. becomes reversed, with the previously blue end becoming red 

E. disappears because the refractive index isn’t an integer